That seems logical to you, but it’s not biblical. It’s certainly not how someone saved by the free grace of God should think. Once someone has been truly saved he hates his sin and is increasingly aware of, and grieved by, his sin. I could respond with numerous passages of Scripture, but I suggest you study Romans 6 in particular.
“What shall we say then? Shall we continue in sin, that grace may abound? God forbid. How shall we, that are dead to sin, live any longer therein?”
—Romans 6:1-2
Correct me if I'm wrong, but it appears that the Protestant position is that once you are saved, nothing you do can merit the loss of salvation. By that logic, you can do anything you want and still be saved. You could walk into the strip club and solicit a lap-dance from one of the strippers.
Is someone who would do that not really saved as he thought? So, how can you know who is saved, since everybody sins to one degree or another? By that logic, no one can be absolutely sure of his own salvation while on earth. And that seems to lead back to the Catholic position on salvation.
Romans 6 doesn't suggest that a "saved" person cannot possibly sin -- it merely says God forbid that we fall into sin and admonishes us not to sin, and that being one with the will of God will lead to holiness and eternal life. Not that we will be guaranteed not to separate ourselves from God's will.